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# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
# pylint: disable=C,R,W
from superset.db_engine_specs.base import BaseEngineSpec


class DruidEngineSpec(BaseEngineSpec):
    """Engine spec for Druid.io"""
    engine = 'druid'
    inner_joins = False
    allows_subquery = False

    time_grain_functions = {
        None: '{col}',
        'PT1S': 'FLOOR({col} TO SECOND)',
        'PT1M': 'FLOOR({col} TO MINUTE)',
        'PT1H': 'FLOOR({col} TO HOUR)',
        'P1D': 'FLOOR({col} TO DAY)',
        'P1W': 'FLOOR({col} TO WEEK)',
        'P1M': 'FLOOR({col} TO MONTH)',
        'P0.25Y': 'FLOOR({col} TO QUARTER)',
        'P1Y': 'FLOOR({col} TO YEAR)',
    }

    @classmethod
    def alter_new_orm_column(cls, orm_col):
        if orm_col.column_name == '__time':
            orm_col.is_dttm = True
